The Caran d’Ache Pencil Sharpening Machine might just be the last pencil sharpener you will ever buy! The Swiss-made, solid metal sharpener is built to last, and mounts on any side to your desk, table or bookcase. It sharpens round, hexagonal or triangular pencils and pastels, from 4-10mm in diameter. Pinch the butterfly clamps and the holding mechanism glides out to accept a pencil. Release the clamps and the pencil is held in position for perfect sharpening. Just turn the crank – no holding necessary! An adjusting knob controls the length of the point.